It is well known that spaces for velocity and pressure cannot be chosen arbitrary but have to satisfy the so–called Ladyženskaya–Babuška–Brezzi (LBB) condition (see [1]}). This is due to the saddle–point nature of the incompressible Navier–Stokes equations. The simplest choice for \(_h(\Omega _h)\times _h(\Omega _h)\)  which satisfies LBB condition and condition imposed by discrete Laplace–Beltrami operator for curvature evaluation discussed above, is \([1(\Omega _h)]^d\times 1(\Omega _h)\) . Here, 1 denotes the mini–elements, i.e. 1 elements enriched with the cubic bubble function.
